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Age: 64

Sex: Female

Indication: New onset daily headache

Choroid Plexus in the Temporal Horns

Mimicking Subarachnoid Hemorrhage

Findings Relating to the Mimic

  • Areas of high density within the temporal horns of the lateral ventricles bilaterally, which have attenuation values up to 150 Hounsfield units compatible with physiologic calcifications of the choroid plexus in these regions.


  • Usually choroid is easy to differentiate from hemorrhage given the characteristic location and physiologic calcification.  Using bone windows and measuring point value attenuation may help you confidently identify calcification associated with choroid.
  • Choroid plexus is also found in the foramina of Luschka, along the posterior medullary velum of the fourth ventricle, and along the roof of the third ventricle.


Stippled hyperdensity in bilateral temporal horns (more prononced on the left), compatible with physiologic calcification of choroid plexus.

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